I've followed the instructions to remove redundant workstations from the DB - startser NDSLookupForDB
Rename the lookup file (DeleteWSList.txt) to inventoryremovallist.txt found in ZENworks_installation_path\zenworks\inv\server\wmi nv\properties directory. StartSer RemoveInventory to start the Inventory Removal service.

But the workstations are not removed. The zenworks inventory service console screen shows: delete scan being processed for "computer_name...."
then immediately following that the console reports that the str file for that same computer was sucessfuly stored.

Any ideas on how to get rid of these old workstations?
Zen 7.0.1